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Thu, 20 Aug 2026 05:48:34 -0700 (PDT) Received: from DE-PF5B95TD.embedded.cmblu.dev ([87.129.199.250]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a3ff1563c5sm2270449a12.14.2026.08.20.05.48.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Aug 2026 05:48:34 -0700 (PDT) From: Wadim Mueller To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Peter Maydell , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Bin Meng , Paolo Bonzini , Fabiano Rosas , Wadim Mueller Subject: [RFC PATCH v2 04/14] hw/char: add TI AM64x UART model Date: Thu, 20 Aug 2026 14:48:04 +0200 Message-ID: <20260820124824.618671-5-wafgo01@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260820124824.618671-1-wafgo01@gmail.com> References: <20260820124824.618671-1-wafgo01@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::529; envelope-from=wafgo01@gmail.com; helo=mail-ed1-x529.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org The AM64x UART is an 8250-compatible core with a TI-specific mode-select register (MDR1) that has to be taken out of "disabled" state before the UART transmits, plus a power/emulation management register. Wrap the generic 16550 model to provide these. Signed-off-by: Wadim Mueller --- hw/char/Kconfig | 4 ++ hw/char/meson.build | 1 + hw/char/ti-am64-uart.c | 109 +++++++++++++++++++++++++++++++++ include/hw/char/ti-am64-uart.h | 28 +++++++++ 4 files changed, 142 insertions(+) create mode 100644 hw/char/ti-am64-uart.c create mode 100644 include/hw/char/ti-am64-uart.h diff --git a/hw/char/Kconfig b/hw/char/Kconfig index 020c0a84bb..c06811130a 100644 --- a/hw/char/Kconfig +++ b/hw/char/Kconfig @@ -31,6 +31,10 @@ config SERIAL_MM bool select SERIAL +config AM64_UART + bool + select SERIAL + config SERIAL_PCI bool default y if PCI_DEVICES diff --git a/hw/char/meson.build b/hw/char/meson.build index fc3d7ee506..71c35af357 100644 --- a/hw/char/meson.build +++ b/hw/char/meson.build @@ -22,6 +22,7 @@ system_ss.add(when: 'CONFIG_VIRTIO_SERIAL', if_true: files('virtio-console.c')) system_ss.add(when: 'CONFIG_XEN_BUS', if_true: files('xen_console.c')) system_ss.add(when: 'CONFIG_XILINX', if_true: files('xilinx_uartlite.c')) system_ss.add(when: 'CONFIG_DIVA_GSP', if_true: files('diva-gsp.c')) +system_ss.add(when: 'CONFIG_AM64_UART', if_true: files('ti-am64-uart.c')) system_ss.add(when: 'CONFIG_AVR_USART', if_true: files('avr_usart.c')) system_ss.add(when: 'CONFIG_COLDFIRE', if_true: files('mcf_uart.c')) diff --git a/hw/char/ti-am64-uart.c b/hw/char/ti-am64-uart.c new file mode 100644 index 0000000000..41d02060eb --- /dev/null +++ b/hw/char/ti-am64-uart.c @@ -0,0 +1,109 @@ +/* + * TI AM64x UART emulation + * + * Copyright (c) 2025 CMBLU Energy AG + * Author: Wadim Mueller + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "hw/char/ti-am64-uart.h" +#include "migration/vmstate.h" +#include "hw/core/qdev-properties.h" + +static uint64_t am64_uart_read(void *opaque, hwaddr addr, unsigned size) +{ + AM64Uart *au = AM64_UART(opaque); + + if (addr >= (8 << au->regshift)) { + return 0; + } + + return serial_io_ops.read(&au->serial, addr >> au->regshift, 1); +} + +static void am64_uart_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + AM64Uart *au = AM64_UART(opaque); + value &= 255; + if (addr >= (8 << au->regshift)) { + return; + } + + serial_io_ops.write(&au->serial, addr >> au->regshift, value, 1); +} + +/* + * Registers are byte-wide and little-endian. TI-specific registers outside + * the 16550 window are RAZ/WI; MDR1 == 0 means the 16x mode we implement. + */ +static const MemoryRegionOps am64_uart_ops = { + .read = am64_uart_read, + .write = am64_uart_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid.max_access_size = 8, + .impl.max_access_size = 8, +}; + +static void am64_uart_realize(DeviceState *dev, Error **errp) +{ + AM64Uart *au = AM64_UART(dev); + SerialState *s = &au->serial; + + if (!qdev_realize(DEVICE(s), NULL, errp)) { + return; + } + + memory_region_init_io(&s->io, OBJECT(dev), + &am64_uart_ops, au, "serial", + 64 << au->regshift); + sysbus_init_mmio(SYS_BUS_DEVICE(au), &s->io); + sysbus_init_irq(SYS_BUS_DEVICE(au), &au->serial.irq); +} + +static const VMStateDescription vmstate_am64_uart = { + .name = "ti-am64-uart", + .version_id = 1, + .minimum_version_id = 1, + .fields = (const VMStateField[]) { + VMSTATE_STRUCT(serial, AM64Uart, 0, vmstate_serial, SerialState), + VMSTATE_END_OF_LIST() + } +}; + +static void am64_uart_instance_init(Object *o) +{ + AM64Uart *au = AM64_UART(o); + + object_initialize_child(o, "serial", &au->serial, TYPE_SERIAL); + + qdev_alias_all_properties(DEVICE(&au->serial), o); +} + +static const Property am64_uart_properties[] = { + /* AM64x has adjacent 16550 registers four bytes apart. */ + DEFINE_PROP_UINT8("regshift", AM64Uart, regshift, 2), +}; + +static void am64_uart_class_init(ObjectClass *oc, const void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + + device_class_set_props(dc, am64_uart_properties); + dc->realize = am64_uart_realize; + dc->vmsd = &vmstate_am64_uart; +} + +static const TypeInfo types[] = { + { + .name = TYPE_AM64_UART, + .parent = TYPE_SYS_BUS_DEVICE, + .class_init = am64_uart_class_init, + .instance_init = am64_uart_instance_init, + .instance_size = sizeof(AM64Uart), + }, +}; + +DEFINE_TYPES(types) diff --git a/include/hw/char/ti-am64-uart.h b/include/hw/char/ti-am64-uart.h new file mode 100644 index 0000000000..5cf820dc20 --- /dev/null +++ b/include/hw/char/ti-am64-uart.h @@ -0,0 +1,28 @@ +/* + * TI AM64x UART emulation + * + * Copyright (c) 2025 CMBLU Energy AG + * Author: Wadim Mueller + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef HW_SERIAL_TI_AM64_H +#define HW_SERIAL_TI_AM64_H + +#include "hw/char/serial.h" +#include "hw/core/sysbus.h" +#include "qom/object.h" + +#define TYPE_AM64_UART "ti-am64-uart" +OBJECT_DECLARE_SIMPLE_TYPE(AM64Uart, AM64_UART) + +struct AM64Uart { + SysBusDevice parent; + + SerialState serial; + + uint8_t regshift; +}; + +#endif -- 2.43.0